linux-kernel - Re: [PATCH v5 1/2] usbip: tools: add options and examples in man page related to device mode

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Date:   Wed, 24 Mar 2021 17:50:12 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     "Hongren Zheng (Zenithal)" <i@...ithal.me>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Antonio Borneo <borneo.antonio@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        matt mooney <mfm@...eddisk.com>, linux-usb@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/2] usbip: tools: add options and examples in man page
 related to device mode

On 3/24/21 12:35 AM, Hongren Zheng (Zenithal) wrote:
> The commit e0546fd8b748 ("usbip: tools: Start using VUDC backend in
> usbip tools") implemented device mode for user space tools, however the
> corresponding options are not documented in man page.
> 
> This commit documents the options and provides examples on device mode.
> Also the command `usbip port` is documented.
> 
> Signed-off-by: Hongren Zheng <i@...ithal.me>
> ---
>   tools/usb/usbip/doc/usbip.8  | 42 +++++++++++++++++++++++++++++++++++-
>   tools/usb/usbip/doc/usbipd.8 | 26 ++++++++++++++++++++++
>   2 files changed, 67 insertions(+), 1 deletion(-)
> 
> PATCH v2:
>       Add signed-off-by line
> 
> PATCH v3:
>       Move patch changelog after the marker line
>       Remove nickname in signed-off-by line
> 
> PATCH v4:
>       Use commit short hash and message instead of long hash only when
>         referring to commit in the kernel
> 
> PATCH v5:
>      Add documentation of `usbip port` and its usage in examples
>      Add flow of detaching in examples
>      Rephrase some description and add punctuations
>      Fix typo of `usbip attach --ev-id` to `--dev-id`
> 
> diff --git a/tools/usb/usbip/doc/usbip.8 b/tools/usb/usbip/doc/usbip.8
> index a15d20063b98..1f26e4a00638 100644
> --- a/tools/usb/usbip/doc/usbip.8
> +++ b/tools/usb/usbip/doc/usbip.8
> @@ -49,10 +49,17 @@ then exit.
>   Attach a remote USB device.
>   .PP
>   
> +.HP
> +\fBattach\fR \-\-remote=<\fIhost\fR> \-\-device=<\fIdev_id\fR>
> +.IP
> +Attach a remote USB gadget.
> +Only used when the remote usbipd is in device mode.
> +.PP
> +
>   .HP
>   \fBdetach\fR \-\-port=<\fIport\fR>
>   .IP
> -Detach an imported USB device.
> +Detach an imported USB device/gadget.
>   .PP
>   
>   .HP
> @@ -73,12 +80,26 @@ Stop exporting a device so it can be used by a local driver.
>   List USB devices exported by a remote host.
>   .PP
>   
> +.HP
> +\fBlist\fR \-\-device
> +.IP
> +List USB gadgets of local usbip-vudc.
> +Only used when the local usbipd is in device mode.
> +Note that this can not list usbip-vudc USB gadgets of the remote device mode usbipd.
> +.PP
> +
>   .HP
>   \fBlist\fR \-\-local
>   .IP
>   List local USB devices.
>   .PP
>   
> +.HP
> +\fBport\fR
> +.IP
> +List imported devices/gadgets.
> +.PP
> +
>   
>   .SH EXAMPLES
>   
> @@ -90,8 +111,27 @@ List local USB devices.
>       client:# usbip attach --remote=server --busid=1-2
>           - Connect the remote USB device.
>   
> +    client:# usbip port
> +        - List imported devices/gadgets.
> +
>       client:# usbip detach --port=0
>           - Detach the usb device.
>   
> +The following example shows the usage of device mode
> +
> +    server:# usbip list --device
> +        - List gadgets exported by local usbipd server.
> +
> +    client:# modprobe vhci-hcd
> +
> +    client:# usbip attach --remote=server --device=usbip-vudc.0
> +        - Connect the remote USB gadget.
> +
> +    client:# usbip port
> +        - List imported devices/gadgets.
> +
> +    client:# usbip detach --port=0
> +        - Detach the usb gadget.
> +
>   .SH "SEE ALSO"
>   \fBusbipd\fP\fB(8)\fB\fP
> diff --git a/tools/usb/usbip/doc/usbipd.8 b/tools/usb/usbip/doc/usbipd.8
> index fb62a756893b..d974394f86a1 100644
> --- a/tools/usb/usbip/doc/usbipd.8
> +++ b/tools/usb/usbip/doc/usbipd.8
> @@ -29,6 +29,12 @@ Bind to IPv4. Default is both.
>   Bind to IPv6. Default is both.
>   .PP
>   
> +.HP
> +\fB\-e\fR, \fB\-\-device\fR
> +.IP
> +Run in device mode. Rather than drive an attached device, create a virtual UDC to bind gadgets to.
> +.PP
> +
>   .HP
>   \fB\-D\fR, \fB\-\-daemon\fR
>   .IP
> @@ -86,6 +92,26 @@ USB/IP client can connect and use exported devices.
>           - A usb device 1-2 is now exportable to other hosts!
>           - Use 'usbip unbind --busid=1-2' when you want to shutdown exporting and use the device locally.
>   
> +The following example shows the usage of device mode
> +
> +    server:# modprobe usbip-vudc
> +        - Use /sys/class/udc/ interface.
> +        - usbip-host is independent of this module.
> +
> +    server:# usbipd -e -D
> +        - Start usbip daemon in device mode.
> +
> +    server:# modprobe g_mass_storage file=/tmp/tmp.img
> +        - Bind a gadget to usbip-vudc.
> +        - in this example, a mass storage gadget is bound.
> +
> +    server:# usbip list --device
> +        - List gadgets exported by local usbipd server.
> +
> +    server:# modprobe -r g_mass_storage
> +        - Unbind a gadget from usbip-vudc.
> +        - in this example, the previous mass storage gadget is unbound.
> +
>   .SH "SEE ALSO"
>   \fBusbip\fP\fB(8)\fB\fP
>   
> 

Thank you. Looks good.

Acked-by: Shuah Khan <skhan@...uxfoundation.org>

thanks,
-- Shuah